The synthesis of nanostructured NiCrAlY powders for plasma sprayed thermal barrier coatings
The synthesis of nanostructured NiCrAlY powders for plasma sprayed thermal barrier coatings
复制标题
等离子喷涂热障涂层纳米结构NiCrAlY粉末的合成
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Daroonparvar
中科院分区：
文献类型：
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作者：
M. Hussain;M. Daroonparvar
热障涂层（tbc）用于保护工业燃气轮机叶片的热段免受高温腐蚀和氧化。它们通常由隔热陶瓷顶层（钇稳定氧化锆或YSZ）和热喷涂到镍基高温合金基体表面的抗氧化金属粘结层（mccraly）组成。目前，直径达100微米的MCrAlY粉末被工业燃气轮机部件制造商用于生产热障涂层。研究发现，纳米晶MCrAlY层在高温下比目前使用的微结构MCrAlY层具有更好的氧化性能。本研究以传统Ni22Cr10Al1.0Y粉末为基材，采用行星球磨机装置制备纳米晶NiCrAlY粉末。利用x射线衍射、扫描电镜和能谱仪对NiCrAlY粉末制粉前后的微观结构进行了表征。结果表明，合成的NiCrAlY粉末主要由两相组成：？（Ni,Cr-rich）和？（ni3al）。关键词：MCrAlY粉末，高温氧化，球磨，空气等离子喷涂涂层
Thermal barrier coatings (TBCs) are used to protect hot sections of industrial gas turbine blades against high temperature corrosion and oxidation. They usually consist of a thermally insulating ceramic top layer (Yittria Stabilized Zirconia or YSZ) and an oxidation resistant metallic bond coat (MCrAlY) thermally sprayed onto the nickel-based superalloy substrate surfaces. Currently MCrAlY powders, up to 100µm in diameter are used in the production of thermal barrier coatings by the industrial gas turbine component manufacturers. It has been found that the nanocrystalline MCrAlY layer provide better oxidation behavior than the currently used microstructured MCrAlY layer at elevated temperatures. In this research work, nanocrystalline NiCrAlY powders were manufactured using a conventional Ni22Cr10Al1.0Y powder as the base material using a planetary ball mill device. The microstructural characterization of NiCrAlY powders before and after milling were explored using X-ray diffraction, scanning electron microscope equipped with energy dispersive spectrometer. The results indicated that the synthesized NiCrAlY powders mainly consists of two phases: ? (Ni,Cr-rich) and ? ’ (Ni 3 Al) . Key words : MCrAlY powders, High temperature oxidation, Ball milling, Air-plasma sprayed coatings.